Organizational change is defined here as processes by which an organization alters its structures and or culture due to internal or environmental factors. A fundamental aspect of change is that it is a process, not an event. Various synonyms for change appear in the management literature, such as reform, renewal, and improvement. Change can be regarded as a fact, but it is not the same as improvement, which is based on judgment. A major implication for evaluation is that empirical evidence should be a major factor in decision making about change. This is usually achieved by ongoing cooperative interactions between evaluators and organizational management.